A recent research shows that there _____ volcanic activities on the moon and Mars. However, they no longer exist now.
Mr. Brown knows little Japanese,so he can't understand the ________ on the bottle of the pills.
_______ successful docking of Shenzhou VIII with Tiangong-I means that China has managed to take ________ first important step to establish its own space station.
--Could I speak to Mr Brown? -- ______ , I'1l go and see if he is in.
The twins look the same. Mr Li find ______ hard to tell one from the other.A it B them C her D that
--Can I speak to Mr Wang? --Sorry, he' s out. Can I _____ a message?